Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842d8f47ef26e0acf6cf733d7a81bb119ea7ae9af92438838f1cabb5bb3e5234' 
  AND token = 'X1k0tPHH6Q4YvGXXEWfcD7IMmM57pmF0Q5LYo7iVU0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}